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The research on removal efficiencies of COD and NH4 + in landfill leachate by an application of the modified Eco Bio -Block (EBB) material in Anoxic-Oxic (A-O) system was conducted in the laboratory scale. The experimental results showed that the treatment efficiencies of COD and NH4 + were relatively high. Removal efficiencies of COD and NH4 + in two columns (anoxic and oxic) were 35% and 50%, respectively, after 19-hour in the experimental system at the flow rate of 1 liter per hour. The results of this study might suggest technical solutions toward landfill leachate treatment at the low cost. Moreover, this method could be widely applied to other wastewater sources suitable in the condition of Vietnam.

REMOVAL OF COD AND AMMONIUM FROM LANDFILL LEACHATE BY USING A MODIFIED ECO - BIO – BLOCK MATERIAL IN ANOXIC-OXIC SYSTEM